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2,326 Articles
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The world's best gem articles, published weekly.

Most Recent Articles

Is a D Color Flawless Diamond Worth the Price?

A D color flawless diamond has the highest color and clarity grade — and the biggest price tag. Are these premium diamonds worth the extra money?

Rose Quartz Value, Price, and Jewelry Information

A popular variety of colored quartz, rose quartz makes a durable jewelry stone. Although commonly cabbed and carved, more transparent material can also be faceted.

Gemstone Certificates

Can you rely on gemstone certificates to reveal everything that can affect the value of pricey gems? Learn what to look for when you have a gem certified.

Ruby and Sapphire Survey: Where Do You Draw the Line?

Our survey asked for your input on the age-old question: where is the line between ruby and sapphire? The results may surprise you.

Rubellite Tourmaline Value, Price, and Jewelry Information

Rubellites are tourmalines with reasonably saturated dark pink to red colors and medium to dark tones. They make excellent jewelry stones, and ruby-red colored specimens without orange or brown overtones are highly prized.

Chinese Checker: Online Faceting Designs and Diagrams

Many square gem designs lack appeal because they’re not very bright. Jeff Graham’s Chinese Checker cut combines good light return with a square outline.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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